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Next, we will finish writing other codes. First, we will define the Upload class. The objects that control the upload process will be created from the Upload class:For codes of the same length, theoretically, the further the coding distance between any two categories, the stronger the error correction capability. Therefore, when the code length is small, the theoretical optimal code can be calculated according to this principle. However, it is difficult to effectively determine the optimal code when the code length is slightly larger. In fact, this is an NP-hard problem. However, we usually do not need to obtain theoretical optimal codes, because non-optimal codes can often produce good enough classifiers in practice. On the other hand, it is not that the better the theoretical properties of coding, the better the classification performance, because the machine learning problem involves many factors, such as dismantling multiple classes into two "class subsets", and the difficulty of distinguishing the two class subsets formed by different dismantling methods is often different, that is, the difficulty of the two classification problems caused by them is different. Therefore, one theory has a good quality of error correction, but it leads to a difficult coding for the two-classification problem, which is worse than the other theory, but it leads to a simpler coding for the two-classification problem, and it is hard to say which is better or weaker in the final performance of the model.影片讲述负债累累的两兄弟为躲避讨债人，逃到阿拉斯加的某处荒野后发生的冒险故事。《荒野逃生》大量戏份发生在阿拉斯加荒野中，拍摄难度非常高。③ SENTINEL slaves　　「究竟什么是幸福？」两人会做出怎样的选择呢？This is our bounden duty, but also our duty.